Fountain pen



June 20, 1950 R. T. WING 2,512,004

FOUNTAIN PEN Filed March 5, 1945 Si) ll/lll 'IIlIIIlIIIIl/ll 'alli/[111111111111111lll/l0 T Q1 A I JNVENTOR.

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Patented June 20, 1950 UNITED STATES PATIENT OFFICE.

, FOUNTAIN PEN Russell T. Wing, Excelsior, Application March 5, 1945, SerialNo. k580,990 j (c1. 12o-52) i y 14 Claims.

i The invention relates generally to fountain pens and more particularly to a fountain lpen of the type shown in my Patents No. 2 ,187,528, issued January 16, 1940, No. 2,282,840, issued May 12,

1942, and No. 2,360,297, issued October 10, 1944.

The general object of the invention is to provide a fountain pen of theforegoing type in which the parts are so shaped as to simplify and facilitate the manufacturethereof.

Another object is to provide a fountain pen of the foregoing type, in which the collector or governor is so constructed that the capillary spaces or cells therein to take up excess flow ink may be readily formed.

A'further object is to provide a fountain pen of the foregoing type, in which the capillary Spaces of the collector or governor, for taking up excess flow of ink through the feed structure of the pen, have a relatively large capacity and are arranged to extend longitudinally of the pen.

Still another object is to provide a fountain pen of the foregoing type, in which the capillary spaces of the collector or governor extend vlongitudinally of the pen and are connected tothe reservoir of the pen and the outside atmosphere at'their ends to empty and fill in a progressive manner from end to end.

A still further object is to provide a fountain pen of the foregoing type, in which the capillaryspaces orcells for taking up excess ink extend longitudinally of the pen and are connected tothe outside atmosphere through an air passage in-` communication Awith the-rear ends ofthe ncells andto the reservoir of the pen through a duct in communication with the front ends of the cells whereby the cells ll gradually from front to rear,

upon excess flow, and empty from the rear toward the front.

' Another object is to provide a novel fountain pen of the foregoing type, which may have an outward appearance similar to that shownin the. Baker Patent No. 2,223,541, issued December ,3;

- Fig. 2 is a transverse ,sectional View taken onV the line 2 2 of Fig. 1. Y Y. Fig.' 3 is a transverse sectional VView taken on the line 3-3 ofFig.11.' v i f Fig. 4 is aftransverse sectional View taken on the une 4'4 of Fig. 1. A

Fig. 5 is a view similar to Fig. 1, but showing a modified form of construction. i f

Fig. 6 lis a transverse sectional view taken the une s--s of Fig. 5. f

Fig. 7 is a transverse sectional View takerilonjv the une 1 1 of Fig. 5. Y 'f- IFig. 8 is a transverse sectional view the line 8-8 of Fig.` 5.

A pen embodying the features of the inventionl is of the type shownn my prior patents andv in-v cludes a shell enclosing the feed structure ofthe pen. The feed structure includes a governor having a feed ductforconveying ink from'the reservoir of the pen to the nib. The governor also has means for receiving and storingfink under conditions of excess flow, which meansv serves lto control the fl'ow of air to the reservoir as the'ink is consumed at the writing tip of thepen In the present instance, themeans for receivaken 'on ing and storing excess'ink comprises a plurality of cells or spaces in the governor, and said meansis so constructed as to facilitate the forming of said cells, thus simplifying the manufacturing problems involved inthe pen. To this end,the governor is provided'with-a pluralityfof longitudinally extending radial- 'slits which constitute such spaces and Which-'may be readily formedfin'' the governor. Thefeed duct for conveying theink from the 'reservoir to the nib is also in .they form of a longitudinally'extending slit in thegovernor. i t 1 The slits inthe governor constituting ,the

, means for storing excesslink have a relatively: large capacity, thus definitely preventing leakage; of ink. at the writing tip of the pen, even wheny conditions cause .a relatively large excess flow'i of.r inkfrom the reservoir. .In theforms of con- -H struction shown inthe present application, the; storage cells or spaces have 'their vfront end con-f.;

nected to the reservoir through the ink feed duct,;.

ervoir l I adaptedtoreceive and. hold a supplyof,

ink. While the reservoir, inthe present instance, is shown asvbeing provided by the barrel and shell, a member. the invention not limited to such ,con-f.v

struction ibut a well-known rubber sac construction may -be used, if desired.

The shell member I tapers toward its front end and is there provided with a centrally located opening I2 in which a nib `I3 is mounted. The nib I3, in the present instance, is of the tubular type and has a writing tip I4 extending a short distance beyond the shell member I0. The nib I3 is also provided with the usual slit I5 and pierce IE. The under side ofthe shell member I0 at the front end is'curved upwardly, as at I'I, toward the writing tip I4 of the nib to provide for adequate clearance from the Writing surface when the pen is in use.

Mounted within the shell member I0 is a governor or collector member 20 provided with a flange 2I at its rear end tting snugly within the shell member I0 to support the lgovernor in centered relation thereto. The governor 20 is provided with a central bore 22 enlarged, as at 23, to receive the rear portion of the tubular nib I3, and further enlarged, as at 24, to receive an in- 'Wardly extending tubular portion 25 formed integrally with the front end of the shell member I0. The portion 25 thus supports the governor at its front end in centered relation to the shell member. In the bore 22 and within the tubular nib I3 and ybore I2 of the shell member is an air tube 26, the front end of which is open to the outside atmosphere at. the front end of the shell member.

To conduct ink fromthe reservoir I I to the slit I in the nib and thus to the writing tip I4, the governor 20 is provided with a feed duct comprising an outer enlarged portion 30 and an inner narrower portion 3I. The inner narrower portion 3| is cut through to the central bore 22 of the governor, as at 32, from a point spaced forwardly from the rear end of the governor and extending to the front end thereof. The air tube 25 is flattened as at 3,3 to provide a segmental passage extending from the part 32 of the narrow slot 3| forwardly to the nib slit I5. Thus, ink may flow through the feed duct into the segmental portion 33 and forwardly to the nib slit I5 to be fed to the writing tip I4 of the nib.A

Under conditions of excess flow of ink which may occur, for example, when the heat of the hand causes the air in the reservoir to expand and thus permit ink to run therefrom, the governor 20 of my present construction is adapted to receive and store such excess ink, as in the case of the construction shown in my prior patents. However, in the present instance, the storage means extends longitudinally of the governor and may comprise a plurality of radial slots 34 extending through the major portion of the length of the governor 2D. The slots 34 may be readily formed in the governor and thus facilitate the manufacture of this part of the pen. They also have a large capacity, which provides for suiilcient storage space, even under extreme conditions of excess flow. In order to provide fork the maximum storage space by these slots, the slots are alternately made ydeep and shallow, as shown in Figs. 2, 3 and 4. Inthe construction herein Shown, the slots 34 are open at the front end of the governor but terminate short of the rear end and do not communicate directly with the reservoir II. The flange 2| at the rear end of the governor thus provides a` partition between the reservoir and the cells 34.

When the pressure relationship of the air within the reservoir changes to such an extent as to cause an excess ow therefrom, the excess ink, in-

mosphere.

4 stead of passing through the segmental passage 33 to the nib, will flow through the front end ci the feed duct into the annular space, indicated at 35, in the front end of the cell and surrounding the tubular extension 25. rI'lie annular space 35 is open to all of the cells 34 and thus serves as a manifold for the flow of excess ink into the cells 34. The rear ends of the cells 34 open into a manifold 3B provided by an arcuate circumferentially extending cut in the governor member immediately in front of its flange 2I. Extending radially inward from the manifold 35 is a Apassage 3l opening into the interior l0 of the tube 26. The rear ends of the cells 3d therefore are in free communication with the outside at- Thus, when excess ink flow occurs, the front manifold 35 will `be filled and the cellular spaces 34 will gradually fill, depending upon the extent of excess flow, the air in such cells be ing driven out through the manifold 35, the radial passage 3l and the interior 40 of the tube 26. Further storage space is provided by so dimensioning the governor as to be spaced from the adjacent wall of the shell member It, as shown at 4I.

In using the pen, ink will be fed forwardly from the reservoir II through the narrow portion 3| of the feed slot, then into the segmental passage 33 and nally into the slit I5 of the nib to be carried to the writing tip of the pen. All of these passages are, of course, of capillary size. Should excess flow occur, the enlarged portion 30 of the feed duct will Ibecome lled with ink and, eventually, the manifold space 35 inthe front end of the shell. If the excess flow still continues, the ink will then start to fill the capillary spaces 34 as well as the space ill between the governor and the shell, the filling taking place from the yforward end of the governor progressively toward the rear end. During such filling, air will be driven out of the cellular spaces through the manifold 38, the radial passage .'l'I and the interior l0 of the central tube 25. The flange 2l of the governor, since it lits snugly within the shell member I0, prevents any direct cornmunication between the cellular spaces and the reservoir. The air supply to the reservoir thus becomes closed when the cellular spaces 'fill with ink.

As ink is consumed at the writing tip, further ink cannot be withdrawn from the reservoir since no air can gain access thereto replace it. The ink supply at such time, therefore, is drawn from the manifold 35 into the feed duct and, in turn, is withdrawn from the cellular spaces. Since the rear ends of the cellular spaces yare open to the atmosphere through the interior of the central tube 2B, the cellular spaces will progressively empty from rthe rear toward the front. When the cellular spaces and the front manifold 35 are thereby emptied, the feed duct may then draw ink from the reservoir and air may passy through thecellular spaces into the front manifold 35 to bubble up into the reservoir through the enlarged portion 30 of the 4feed duct, the rear end of the portion 30 constituting a Weir vent controlling the flow of air to the reservoir.'

All the passages and spaces herein described. ofcourse, must be properly related in size toprovide a proper feed of ink. While the proportion.- ing of these sizes is the essential point and the various spaces and passages are not limited' to definite sizes, an example of such sizes may be given merely to illustrate the structure. Thus, the slit I5 in the nib may be from .0005 to .002

'l of anfinch. The segmental passage 33 may-have a maximum depth of '.005 tof.007 of an'inch. The 566narrow portion `3 I. of the feedduct-preferably has a climensionof` .005 of aninch, lw-hile the Wider portion 30 should have no dimension less than .010 of an inch. The cells 34-are prefer.- ably of uniformwidth throughouttheir length and mayhave a Width of .010 to: .015 of an inch.

The front manifold35 preferablyhas a minimumdimension of .010 Vof an inch to yconform to the dimensions of the enlarged portion 30 of the feed duct and the cells 34. The -rear manifold 36, radial passage 31 and the interior 40 of the central tube 26 are substantially larger than the cells 34. While the invention is not limited to the foregoing dimensions, such dimensions are found to be suitable. l

In the modified construction shown in Figs. 5, 6, 7 and 8, I show a pen comprising a barrel 50 having a pen section 5| at thefront end thereof. `The pen section 5| is herein shown as integral with the barrel 50 but may, of course, be a separate part rigidly secured to the barrel. 'The pen section 5| isprovided with a central bore of uniform diameter adapted to receive a shell member 52 of .generally cylindrical form. Adjacent the front end of the pen section 5|, the internal bore thereof is arcuately enlarged, as at 53, to receive the rear end of a nib 54 held in place by the shell 52. The nib and shell project beyond the end of the pen section with the nib overlying the vshell and having itswriting tip 55 projecting a short distance beyond the shell. The nib 54 is provided with the usual slit 56 and a pierce 51. 'Ihe front end of the shell 52 is curved'upwardly-as at 58, toward the nib. l

Mounted within the shell and fitting snugly therein is a governor 60. The governor 60 is provided with a central bore 6|. .which is enlargedat its front end, as at 62, to receive an inwardly extending tubular portion 63 providing an opening to the outside atmosphere at the front end of the shell. The Vtubular portion 63 may be formed integrally with the shell or may be a tube cemented into an opening in the shell.

To feed ink to the nib from the reservoir, which in this instance is constituted` by; the interior of the barrel 50, a feed duct is provided in the governor 60. The feed duct extends throughout the length of the governor and comprises a drilled hole 64 and a radial slit 65 extending inwardly from the periphery of the governor to the drilled hole 64. The front end of the governor is flattened, as at 66, to provide a segmental passage connected with the feed duct and underlying the slitted portion of the nib. To provide communication between the segmental passage` formed by the flattened portion 66 and the slit 56 in the nib, a plurality of parallel slots 61 are` cut through the shell. Thus, ink may flow from the reservoir through the feedduct into the segmental passage 66, through the parallel slots 61 and into the nib slit-56 to be fed to the writing tip 55 of the nib. l

To provide means for receiving and storing ink under conditionsofexcess flow, the governor ing-the front vends'ofall-:thefstorage-rcells 'l0l with the feed duct, kand particularly'with the enlarged or drilled portion 64 thereof. Adjacent the rear end of the governor is a rear manifold 12 formed by an arcuate circumferentially extending cut in the governor, andan inwardly directed radial passage 13 provides communication,- between the rear manifold 12 and the internalA bore 6| of the governor. The cells 10 thus communicate at one end with the reservoir through the front manifold 1| in the feed duct and communicate with the outside atmosphere at their rear end through the rear manifold 12, the radial passage 13 and the central bore 6| of the governor.

is similar to the operation of the structure shown in Fig. 1. Thus, when excess ink flows from the reservoir, it is carried through the feediduct to the front'manifold 1| and then progressively fills the cells 10 from the front toward the rear, air being forced out of the cells through the rear manifold 12, the radial passage 13 and the internal bore 6| of the governor. By filling the cells andthe front manifold 1| with ink, no air can Thus, further consumption;

reach the reservoir. of ink at the writing tip 55 musty draw such ink from lthat contained in the cells and front manifold, thereby emptying them from their rear ends toward their front ends. When the cells 10 and front lmanifold 1| are entirely emptied, further writing will draw ink from the reservoir, and air may `pass through the cells from the rear manifold, then through the front manifold 1| to bub-l ble back through the large portion 64 of the feed, duct into the reservoir. The rear end of the feed duct, and particularly the rear endy of the enlarged portion 64, thus constitutes a weir ventcontrolling the admission of air to the reservoir. As an example of suitable dimensions for 4the various passages and cells in this construction, the Anib slit, as in the previous form, is preferably .0005 to .002 of an inch in width. The parallel slits 61 in the shell member may, respectively, be .004, .005 and .006 of an inch in width, to insure the passage of ink in case the smaller one becomes clogged, or each may be approximately .005 of an inch in width. The,` flattened portion 66 on thefront end of the governor pro-A vides a segmental passage havinga maximum depth of .005 to .007 of an inch. The narrow slitted portion 65 of the feed duct is preferably .005 of an inch, while the drilled portion 64 thereof is preferably .010 of an inch in diameter. The storage spaces, which are preferably of uniform width throughout their length, may have a width of .010 of an inch. The front manifold 1| may also have a minimum dimension of .010 of an inch to conform to the width of the cells 10 andthe drilled portion 64 of the feed duct. The invention, of course, as stated above, is not limited to these particular dimensions, but such dimensions are merely given as an example of suitable sizes.

^ I claim: j .1. A fountain pen comprising a reservoir, a nib, and feed structure for controlling the flow of ink from the reservoir to the nib including a shell, and a governor within said shell having. a first radial slit extending throughout the length thereof and constituting an ink feed duct and an air inlet passage connected to said` reservoir, and a plurality of other longitudinally extend-y ing radial slits, said plurality of other slits being ofcapillary size. but of less capillarity than: saidA ink feed duct forrreceiving, underonditigns Operation of this modified form of constructionasesinos-2 2. AlLfuntain-llpenfcomprisingeasresem/in, a niti; andiifeedfstructure -ffor-v controllingstheiow.; off-inklifromf-the reservoir Y# to: thefnibl `com'pl'sngl anL'ink-"JfeeelC duet, andfa L governors'.fors-receiving.; ink--under-' conditions lof excess flow and!I havingf ainadr'nss-onmeans,-a -passage extendingsrears wardlyfromfsaidl'air `:admission l means, aLmani-.gf foldspaeeatthe/rear end-otsaidy passage, .aaplusv rality of-#longitudinally lextending cztpillany inkt. spaces ofele'ss capillarity: than@ saidn feedsduct.v adapted to receive excess ink, and openingaat: theifrear^ends xinto said-Imanifold-T space-,f1` said spaceshbeinginterconnectedaatvltheir frontendsfl and anotherf capillaryfspace:ofessericalznill'arityf` than-"saidfeedlduet #connecteddirectly'.'tor saidz reservoir andsaidxfeediduct: and-connected 1to1 theA front `ends`=of"saidother-:spaces saidmcapil-l lary*spaces*being'adapted ito control the :flow-lof aitcsaid reservoirf i 3iA` A@ fountain 1pen--comprisingar asreservoir, .au niband feed#A structure jfori-fcontrollilfig:tliegfinwf of ink-from the reservoirto tl'lie` nibffcomprising. ashellf having-a'central lair Aopeningsin its fronte endg" anda governonfwithin `thee-shell havingrar. radial slit Y' extending fthrougnoutlthealengthl lof: the-governor Afand comprising an inkl: feedflduotr 6A?.\ fduntain2-fpenz comprisingsrae4 reeel-'xmms nib,tandcfedistmcturencormprsingia:shellhaizingi anuinwardly :ext-ending: :tubular x. portion -z-supnort--I ingdsaidiniband aigovernor. mountedlwithinssaidi shell iandlhavingaanflinkvfeedeductiandfa :plu-f'.

rality =of flclngitudiriallyiextending,.spacessfonfreeJ ceiv'ing andstoringsinkltunderfconditions .of exe; cess-i-w, f saidlvgovernori at;i.it`s rear` end. ftting; snugly-within:saiddshell1 'and-c being .isuppcuztede` at i. its'sfronti end-'lby telescopingdover. said. tubular;

peripherall'y i arranged, longitudinally #extending radial slits Vterminating lshort'of-th'e; rear@ end Iof:V the' governorfaemanifold *space-'l Within -ther' gov ernorfopen to thef-rearend 1of;saidiplurality of slits and lclosed Eat Sits" rea-r1 end-5 and-a; centrali passage" inI thevgovernor# connectingisaidA imanie.I fold space Wit'nssaid-V an1-4 opening: saidfshell,y .hav-'s1 ingl aemanifold' fspace-invfrlont-of 'fsaid.v'governor4 connecting-the frontend'of=said1p1ura1itybof slits with saidi ink feed duct;

'if- A* fountain pen- `comprising..y a Lreservoir; .ai niby-and feed structure for controlling/.the xflowh off-inkfrorn thereservoir to ther nibI comprising: aeshell having` an internal #tubular por-tionfopenf atthe-efront 'end ofthe shell, andiafgovernor: havin'gfa combined ink and `lowspassageeat. oneeside-thereof 1 andl constituting tneso1e,;cons l nection tofsaid'lreservoir-,V afplurality ofl longitun'r dinallyextending capillary vink storage spaces arranged: around. Lthe periphery. thereof;y and a? central passage -connecting said 'tubular portionv withithef-rearvends otisaid1-storage' spaces; said. shell4l having a capillary 'space in: Atheaifront :ends thereof)l surroundings Said-fi tubularv portion: andv connecting thafr'ontfends'- offsaid storage. spacesi with said combined 'ink-:and fair Yflow passage;

5f Affountain -pen comprising as barrely a1 shelL securedY tolthefront endfof the Y'barrel "and having; anfopening--inj its frontend; a.nib :mounted: in said opening', estubev mounted 'insaidlopeningf and-*extending rearwardly` therefrom,4 said ftuloe underlyingfsaid fnib; and ay governor;y having" a: central bore telescoped over said tube,xand1an'= ink feed duct communicating with thelzinterior of said barrel and extending# throughout the. lengtll-4 of` said` governor and lopeningi into.. said; central bore, said tube'fh'alingv a flattenedside underlyingsaid-nilo and extendingrearwardly7 to connect said duct with thenib, said governor also havinga plurality of longitudinally extending' capillary ink storage spaces for receivingrand storing inklunderconditions of `excess-now; said spaces "-being connected at their f rear vends with Said'tubeand jat their front ends 'WitnfsaidLduct atrwbysadduct tosaid reservoir.

inkfunder-condi'tonsof exeessziiow from-therrese,-

ervoir; said means haring-:a-vplunalityr.oelongatex capillary cells of less capillarity than a portio'm offsaid eed-iduot,i extending lengtnwisezofuithe peniandfconnectedf-in .parallel, one .end oflssaids meansV being 'connected togsaidfduct and the `others end connected to tli`ef:-atmosphere,.wherebyusaid means eis'operatiiie'; whenmlearedibfzfink; toiadmit air-- toesaidfieservoir ftlironglnxsaid-` ductyaand .listoperatiyefntherm ftoc-blocleatheefldw ofnairzrto.:

said-"reservoir: l

9.LA Afountairir :pen2 comprising.: asbarrelaihaving: an'nk Weser-voili `Jtli.'erein, asshell' membenrat'zthe front-endosaidrbarrelf aninkaowcontrokgous: ernor `'in-ounteelirisaid'. shell memberzand'forme, ingftheieW-ithat the:fcir-Wardrendfthereota;canile` lary manifoldchamber' aepenu nilos.:mountainsim the front endflofifsaidshell .member and having. an'r-inlifeedsli'tfinlits'; Writingeendgpoition; said. gcvernorfl'iavirigsa:longitudinallyextendingi caps' l illary inkfe'ediiiuct connectingthesreservoir:witlnl within said shell for ink feed and overflow control, a pen nib having an ink feed slit therein and mounted in the forward end of said shell, said governor having a longitudinally extending capillary ink feed duct therein in communication at its rear end with the reservoir and at its forward end with the feed slit of said pen nib, the forward end of Said governor providing with the internal wall of said shell a capillary manifold chamber, said governor being provided with a plurality of longitudinally extending and circumferentially spaced capillary overflow spaces each of lesser capillarity than said ink feed passages and all communicating at their forward ends with said manifold chamber, one of said capillary overflow spaces being directly connected with said ink feed duct and with the ink reservoir and, in turn, connecting all said other overfiow spaces with the ink reservoir for reception of ink therefrom during conditions of overflow in excess of that required for Writing purposes, and means providing an air channel leading from the forward end of said shell member and connected to the rear ends of all said other capillary spaces excepting the overflow space which is directly connected with the reservoir, thereby permitting the flow of air to the ink reservoir by Way of said other capillary spaces, manifold chamber and reservoir-connected overflow space under conditions of no excess flow and blocking such flow of air during conditions of excess flow when said overflow spaces are filled with ink.

11. A fountain pen comprising a reservoir, a nib, and feed structure for controlling the flow of ink from the reservoir to the nib including a shell having an air opening and a space communicating with said opening and a governor mounted within the shell and having an ink feed duct and a plurality of longitudinally extending radial slits opening into said space within said shell at the forward end of said governor, one only of which slits opens at its rear end into said reservoir and is connected with said feed duct, said slits being of capillary width but of less capillary Width than said feed duct and connected thereto for receiving ink under conditions of excess flow, said. air opening, said slits and said space comprising air admission means for controlling the fiow of air to said reservoir.

12. A fountain pen comprising a reservoir, a nib, and feed structure for controlling the flow of ink from the reservoir to the nib comprising an ink feed duct, and a governor for receiving ink under conditions of excess flow and having air admission means, a plurality of longitudinally extending capillary spaces of less capillarity than said feed duct, one of which spaces is connected at one end directly to said reservoir and throughout a substantial portion of its length directly to said feed duct, means connecting said other spaces at one end to said one space, and means connecting the other ends of said other spaces with said air admission means, said spaces being adapted to control the flow of air to said reservoir.

13. A fountain pen comprising a reservoir, a nib, and feed structure for controlling the flow of ink from the reservoir to the nib comprising a shell having an air opening in its front end, and a governor Within said shell having an ink feed duct connected to said reservoir and to said nib, a plurality of longitudinally extending capillary ink spaces of less capillarity than said feed duct adapted to receive ink under conditions of excess flow, a manifold in its rear end connected to all said spaces, and a longitudinally extending passage connecting said manifold With said air opening, said shell having a capillary manifold space adjacent the front end of said governor connecting said capillary spaces with said ink feed duct, and said governor having a further capillary ink space of less capillarity than said feed duct connecting said capillary manifold and said reservoir, said capillary spaces being adapted to control the flow of air to said reservoir.

14. A fountain pen comprising a barrel, a tapering shell secured to the front end thereof, and having an opening in its front end, a nib mounted in said opening with only its writing tip projecting beyond the shell, a governor of tapering form within said shell and having a capillary feed duct for feeding ink from said barrel to said nib, a plurality of capillary ink storage spaces in said governor of less capillarity than said feed duct for receiving and storing ink under conditions of excess flow, said storage spaces extending longitudinally of said governor for substantially the full length thereof and being in communication at one end with said opening and interconnected at the other end, and an additional ink storage space connected at one end to the interconnected ends of said other storage spaces and at the other end to said reservoir and connected to said feed duct throughout a substantial portion of the length thereof and providing With said feed duct the sole connection between said other spaces and said reservoir to control the oW of air to the barrel.

RUSSELL T. WING.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,633,111 Kovacs June 21, 1927 2,176,661 Ashmore Oct. 17, 1939 2,187,528 Wing Jan. 16, 1940 2,282,840 Wing May 12, 1942 2,360,297 Wing Oct. 10,1944 

